python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection
Priority LOW 33CWE-526Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
python-utcp is the python implementation of UTCP. Prior to 1.1.3, _prepare_environment() in cli_communication_protocol.py passes a full copy of os.environ to every CLI subprocess. When combined with CVE-2026-45369, an attacker can exfiltrate all process-level secrets in a single tool call. This vulnerability is fixed in 1.1.3.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Fix Fixed python-utcp (universal-tool-calling-protocol): 1.1.2utcp-cli (PyPI): 1.1.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| universal-tool-calling-protocol | python-utcp | before 1.1.2 | 1.1.2 | Patch available | CNA |
| — | utcp-cli (PyPI) | before 1.1.2 | 1.1.2 | Patch available | GHSA-5v57-8rxj-3p2r |
- python-utcp Vendoruniversal-tool-calling-protocol Affected before 1.1.2 Fixed in 1.1.2 Patch available CNA
- utcp-cli (PyPI) Vendor— Affected before 1.1.2 Fixed in 1.1.2 Patch available GHSA-5v57-8rxj-3p2r
Remediation
- Fix · CNA python-utcp (universal-tool-calling-protocol) Fixed in 1.1.2
- Fix · GHSA-5v57-8rxj-3p2r utcp-cli (PyPI) Fixed in 1.1.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-45370
- 2026-10-03 Alias added: GHSA-5v57-8rxj-3p2r
References
More universal-tool-calling-protocol vulnerabilities
- TI-2026-33160 python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol CVSS 3.1HIGH 8.3
- TI-2026-65093 python-utcp before 1.1.4 SSRF via unvalidated HTTP redirects CVSS 4.0HIGH 8.4
- TI-2026-65092 utcp-http before 1.1.4 OAuth2 tokenUrl Trust Boundary Bypass CVSS 4.0HIGH 7.1
- TI-2026-10502 universal-tool-calling-protocol python-utcp utcp-gql/utcp-websocket server-side request forgery CVSS 4.0MEDIUM 5.3
- TI-2026-65094 utcp-gql and utcp-websocket before 1.1.1 SSRF via URL validation bypass CVSS 4.0LOW 2.3
- TI-2026-65091 python-utcp before 1.1.12 SSRF via Remote HTTP Manual CVSS 4.0HIGH 7.1
Sources
- CVE-2026-45370 · CVE Program
- CVE-2026-45370 · NVD
- FIRST EPSS
- GHSA-5v57-8rxj-3p2r · GitHub Advisory Database · CC BY 4.0
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